Instruction Sheet

Instruction Sheet

Universal junction box (4-20 mA input)

DOC276.53.90025

Safety information

Please read this entire document before unpacking, setting up, or operating this equipment. Pay attention to all danger, warning, and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment.

Make sure that the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that specified in this document.

Important Note: Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special emphasis.

WARNING Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious injury.

Note: Information that supplements points in the main text.

Precautionary Labels Read all labels and tags attached to the instrument. Personal injury or damage to the instrument could occur if not observed. A symbol, if noted on the instrument, will be included with a danger or caution statement in the manual.

Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after 12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC), European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no charge to the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.

Overview

WARNING Possible Explosion Hazard. The sampler connection is not applicable for a direct connection to flow meters classified for use in hazardous locations without approved barriers. If the connection is to a flow meter that is classified for, and used in, a hazardous location, refer to the flow meter control drawing for connection requirements.

Universal Junction Box The universal junction box (8760600) gives the necessary interface between an external flow meter or other device with applicable pulse or current output and the SD900 controller.

This instruction sheet gives:

? The steps to prepare and connect a universal junction box to a SD900 controller with a 4?20 mA input and to a device with a 4?20 mA output. These connections are required for flow proportional sampling.

? The necessary steps to configure the SD900 controller for flow proportional sampling using the 4?20 mA input.

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Universal junction box (4-20 mA input)

SD900 4?20 mA input Pin C of the SD900 controller auxiliary interface can be used as an external pulse input or as a 4?20 mA input. An external flow meter (such as a Sigma 950) can be connected to this input for flow proportional sampling. Note: The 4?20 mA output connector on the Sigma 950 flow meter is a factory installed option (2676) and comes with a 25 ft. output cable (2924).

The SD900 4?20 mA input removes the need for a separate 2021 or 2020 4?20 mA interface in flow proportional sampling applications. Important Note: Do not connect a flow meter that outputs flow pulses on the SD900 auxiliary interface when the sampler is configured for 4?20 mA input.

Pulse Mode Flow proportional sampling requires an external device with applicable pulse or current output such as a Sigma 950 flow meter. In pulse mode, each pulse or contact closure supplied by the external device represents the measurement of a specifed flow-volume. These signals occur more frequently at higher flow rates and less frequently at lower flow rates. Numerical scaling is set in the SD900 FLOW SOURCE menu below PROGRAM SETUP. The SD900 can collect between 1 and 9,999 pulses or closures.

Current Mode In current mode, a flow meter or external device outputs a current value between 4 and 20 mA to the 4?20 mA input of the SD900. (The current input range for the SD900 is 4?20 mA). The 4?20 mA output is proportional to the measured flow rate. Higher current values represent higher flow rates and lower current values represent lower flow rates. The numerical scaling that defines the relationship between the 4?20 mA value and the flow rate must be programmed the same in both the SD900 and the external flow measurement device. Numerical scaling is set in the FLOW SOURCE menu under PROGRAM SETUP in the SD900 controller (see Controller set up for 4?20 mA input on page 9). The sampler calculates a flow rate based on the pulse or current inputs. In either mode, the sampler integrates the flow rate over time to determine an aggregate flow volume. Samples are taken at programmable increments of aggregate flow. Important Note: The 4?20 mA option should only be used when an AC power supply is installed on the flow meter and the SD900. Battery power is not sufficient to support the 4?20 mA current loop power requirements.

Universal junction box

Dimensions Figure 1 shows the dimensions of the Universal Junction Box.

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Universal junction box (4-20 mA input)

Figure 1 Universal junction box dimensions Universal junction box wiring Important Note: For safety, the universal junction box contains a replaceable 5 mm x20 mm fast-acting fuse (6681000) on the sampler Auxiliary Port line (Pin A). This fuse is rated at 0.25 A, 250 V and is manufactured by Cooper Bussman (p/n S500-250mA). Do not rewire the junction box to bypass this fuse. To wire the universal junction box, complete these steps: 1. Strip 1.5 inches off the customer-supplied cable jacket (Figure 2 on page 4). 2. Strip off 0.2 inches from each cable wire (Figure 2 on page 4).

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Universal junction box (4-20 mA input)

Figure 2 Prepare the wire Note: An extra liquid fitting (8783000) can be included when a smaller cable is used. 3. Remove the lid from the universal junction box with a Philips head screw driver. 4. Put the cable through the strain relief. 5. Use Figure 3 and Table 1 to find which terminals to use. For connection to a Sigma

950 flow meter refer to Figure 4.

Figure 3 Universal junction box interior

1 Universal junction box output cable 2 Fuse holder

3 Wiring terminals (refer to Table 1)

Table 1 Terminal assignments

Terminal No. 1

Assignment Fuse

Terminal No. 5

Assignment Inhibit

2

Power

6

Output

3

Common

7

Complete

4

Input

8

Shield

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Universal junction box (4-20 mA input)

Figure 4 Terminal wiring for 950 flow meter

1 To SD900 controller auxiliary connector

3 Output A - (negative) black OR Output B - (negative) green

2 4?20 mA output cable assembly (2924)

4 Output A + (positive) yellow OR Output B + (positive) red

6. Put the wires in the correct terminals and tighten.

7. Tighten the strain relief on the cable. Do not twist the cable leads.

8. OPTIONAL STEP: Apply the gel potting included with the universal junction box kit to the inside of the universal junction box to help prevent vibration effects. The gel is not necessary for junction box installation or use.

To apply the gel, complete the steps below:

a. Twist the static mixer on the gel cartridge.

b. Dispense the gel by using the hand plunger.

c. Discard the first quantity that was dispensed by the static mixer, otherwise it will not mix correctly.

d. With the junction box flat on a horizontal surface, empty the two gel cartridges into the junction box until it is filled. Let the gel set for five minutes.

9. Replace the junction box lid and tighten the screws.

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